Alright, let's work through 5270 times 1661 step by step
5270 × 1661 = 1661 × (5270)
+ 1661 × 0 that results in 0
+ 1661 × 70 giving us 116270
+ 1661 × 200 that is equal 332200
+ 1661 × 5000 giving us 8305000

= 8753470
